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利用静电纺丝技术制备出少层或单层WS_2纳米片与碳纤维均匀混合的复合材料.该材料表现出优异的锂电性能,在100 mA/g的电流密度下,首次充放电比容量高达941/756 mAh/g.本文系统地研究了WS_2的结晶程度对其电化学性能的影响,发现结晶度越低,材料的锂电性能越好,这可能是由于低结晶性的WS_2拥有更大的比表面积,可为锂离子提供更多的界面储存位点.这种静电纺丝制备的WS_2/碳纤维薄膜具有良好的柔韧性,可以直接作为自支撑的负极电极膜使用,并表现出良好的电化学性能.
The electrospinning technique was used to fabricate composite materials with less or even single layers of WS_2 nanosheets mixed with carbon fibers. The nanocomposites exhibited excellent properties of lithium batteries with the first charge-discharge capacity of 941 / 756 mAh / g.In this paper, we systematically studied the influence of the degree of crystallization of WS_2 on its electrochemical performance and found that the lower the crystallinity, the better the lithium performance of the material, which may be due to the lower specific surface area , Which can provide more interface storage sites for lithium ions.The WS_2 / carbon fiber films prepared by electrospinning have good flexibility and can be directly used as self-supporting negative electrode films and exhibit good electrochemical performance .